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Motor driving method and device and air conditioner

A motor drive and current technology, applied in the direction of controlling electromechanical transmission, controlling electromechanical brakes, controlling generators, etc., can solve problems such as component damage and adverse effects on component reliability

Inactive Publication Date: 2018-12-11
AUX AIR CONDITIONING LTD BY SHARE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the input current will fluctuate with the fluctuation of the input voltage, so that a peak current will be generated when the voltage troughs, and the peak current will have a negative impact on the reliability of the components and easily damage the components

Method used

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  • Motor driving method and device and air conditioner
  • Motor driving method and device and air conditioner
  • Motor driving method and device and air conditioner

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0056] The embodiment of the present invention provides an air conditioner 1, which is used to adjust the indoor temperature while avoiding the influence of peak current on the stability of components. see figure 1 , is a functional block diagram of the air conditioner 1 provided by the embodiment of the present invention. The air conditioner 1 includes: a controller 2 , a memory 3 , a motor 4 , a driving circuit 5 and a motor driving device 6 . Wherein, the controller 2 is electrically connected to the memory 3 and the drive circuit 5 , and the drive circuit 5 is electrically connected to the motor 4 . The motor driving device 6 includes at least one device that can be stored in the memory 3 in the form of software or firmware.

[0057] Wherein, the memory 3 can be used to store software programs and units, such as the program instructions / units corresponding to the motor drive device 6 and the method in the embodiment of the present invention, and the controller 2 runs the...

no. 2 example

[0061] The embodiment of the present invention provides a motor driving method, which is applied to the air conditioner 1 described in the first embodiment, and is used to realize the function of driving the motor 4 while avoiding the impact of the peak current generated when the input voltage is low in the traditional technology. impact on component stability. see Figure 4 , is a flowchart of a motor driving method provided by an embodiment of the present invention. The motor drive method includes:

[0062] Step S401: Obtain input voltage, bus voltage and phase current input to a motor 4 .

[0063] It can be understood that the input voltage, the bus voltage and the phase current input to a motor 4 can be collected by the parameter collection module 11 .

[0064] In addition, in this embodiment, the phase currents input to the motor 4 include the u-phase current i u and v-phase current i v .

[0065] Step S402: Calculate the q-axis torque current given value according ...

no. 3 example

[0121] see Figure 7 , Figure 7 A functional block diagram of a motor drive device 6 provided by a preferred embodiment of the present invention. It should be noted that the basic principles and technical effects of the motor drive device 6 provided in this embodiment are the same as those of the above-mentioned embodiment. corresponding content. The motor drive device 6 includes: a parameter acquisition unit 12 , a calculation unit 13 , a voltage given amount determination unit 14 and a pulse width modulation signal generation unit 15 .

[0122] Wherein, the parameter obtaining unit 12 is used to obtain the input voltage, the bus voltage and the phase current input to a motor 4 .

[0123] It can be understood that, in a preferred embodiment, the parameter acquisition unit 12 can be used to execute step S401.

[0124] The calculation unit 13 is used to calculate the q-axis torque current given value according to the bus voltage, the phase current, and the preset rotationa...

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Abstract

The invention provides a motor driving method and device and an air conditioner, which relate to the technical field of air conditioners. The method and device calculate q-axis torque current according to bus voltage, phase current and preset rotational speed reference value, then determine q-axis voltage and d-axis voltage to generate pulse width modulation signal according to q-axis voltage andd-axis voltage to generate pulse width modulation signal. As that q-axis torque current is given through the bus voltage, Phase current, as determined by a preset speed reference value, As a result, the q-axis torque current varies with the bus voltage fluctuation, so that the load power of the power conversion circuit and the motor fluctuates with the voltage fluctuation of the bus bar, Thus, theload power formed by the power conversion circuit and the motor at the low valley of the input voltage is small, thereby avoiding the problem of the input current peak at the low valley of the inputvoltage in the traditional manner, improving the reliability of the component and prolonging the service life of the component.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a motor driving method and device and an air conditioner. Background technique [0002] At present, the driving system of the air conditioner includes a rectifier bridge, a power conversion circuit and a motor. After the three-phase AC power passes through the rectifier bridge, it directly supplies power to the power conversion circuit and the motor connected to the power conversion circuit, so that the motor drives the compressor to work. [0003] However, in the prior art, since the load formed by the power changing circuit and the motor is a constant power load, when the instantaneous value of the input voltage is high, the instantaneous value of the input current is small, and vice versa. Therefore, the input current will fluctuate with the fluctuation of the input voltage, so that when the voltage troughs, a peak current will be generated, and the peak current will ...

Claims

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Application Information

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IPC IPC(8): H02P21/00
Inventor 李发顺卓森庆游剑波
Owner AUX AIR CONDITIONING LTD BY SHARE LTD
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